It would be incredible naïve of us to think, that we are the only intelligent lifeform in the Universe - I see SETI as one oppertunity to seek out other lifeforms that have reached the radiowave-capable "step" of a species evolutionary ladder...
We might not find anything today - tomorrow - next year or in the next decade... But to abbandon searching is to find nothing...
SETI@home and Astropulse are funded by grants from the National Science Foundation, NASA, and donations from SETI@home volunteers. AstroPulse is funded in part by the NSF through grant AST-0307956.